Zinc coatings significantly improve the structural and cosmetic corrosion resistance of steels under automotive paint systems. The increasing use of metallic-coated steels in automotive manufacture has inevitably resulted in areas where the coated steel is joined to cold-reduced steel. Electrochemical reactions at these areas result in poor phosphate deposition, under- paint saponification and eventual chathodic disbondment of the paint. Laboratory phosphating experiments and outdoor weathering trials have highlighed these effects. Pre-coating the zinc surface, usually be prephosphating, prior to joining to the cold-reduced steel, has been found to reduce the extent of these undesirable reactions.


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    Title :

    Automobile corrosion and corrosion control at bimetallic couples


    Additional title:

    Kraftfahrzeugkorrosion und Beeinflussung der Korrosion durch bimetallische Werkstoffpaarungen


    Contributors:
    Isaac, J. (author) / John, V. (author)

    Published in:

    SAE-Papers ; Mar ; 1-16


    Publication date :

    1990


    Size :

    16 Seiten, 11 Bilder


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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    Galvanic Corrosion Prevention of Steel-Aluminum Couples

    Doyle, D. P. / Courval, G. J. / Allin, J. | SAE Technical Papers | 1993